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A research study published in Nature Climate Change. The study has predicted that most severe heat-waves will become more often in the future. The study indicated that at least 30% people in the world are experiencing life-threatening heat for more than 20 days in a year. The study mentioned that it might jump up to 74% by the year 2100 due to continuous growth in the greenhouse gas emissions. The University of Hawaii at Manoa researchers reviewed articles published between 1980 and 2014. They discovered more than 900 and added data on supposed deadly heat-waves. There are more than 800 cases found regarding deadly heat happened in 36 countries. The data includes various events such as the 2003 heat-wave caused more than 5 thousand deaths in Paris and more than 10 thousand deaths reported in Moscow heat-wave in 2010.

The scientists have analyzed these entire events to examine that what thresholds temperature and humidity levels might become more deadly. They adjoined current and previous climate data information in order to calculate the maximum population has been experiencing deadly heat-waves per year. They also used temperature and humidity projections to find out how much it would change in the future. Those projections were based on a future with considerably decreased greenhouse gas emissions and it is still a bad news. At least 48% of the entire population in the world was projected in experiencing at more than 20 days per year of deadly heat by the year 2100.